Housing spa tub hot tub water filter cartridge

-Antibacterial filter, blue paper, blue plastic
-Other end closed with handle
-Other end with thread
-Inner: white plastic mesh

Thread Type
After taking measurements, you will need to identify the filter thread type. There are two main types of threads on the bottom of spa filters, a course thread (SAE) and a fine thread (MPT). The course thread only has a few, larger spirals while the fine thread has many more thinner and closer together spirals.

From there, you will have to determine if the thread is a male thread that comes up from the bottom of the filter, or a female thread , that goes inside the filter. Most hot tub filters that are threaded have the male type connectors.

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